The technique of producing ultrafine powders by vaporization in the highintensity arc has been applied to a number of refractory materials, including oxides, carbides, and metals. Particle size ranges of the products obtained lie generally between 100 and 1000A. Following a brief resume of the processing technique, a description of particulate characteristics is presented. Such properties as average size, shape, size distribution, sinterability, and chemical reactivity are examined, chiefly by electron microscopy, x-ray diffraction, sintering tests, and solution rates.

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